The judgment held that the council, builders Brookfield Multiplex, Walkers Architects and local water-proofing company Charles Norager Ltd were liable.
With the builder and architect in liquidation, the council has been left responsible for paying the full amount, minus a small amount for some allegations the court did not find the council liable for.
Said Mayor Len Brown: "We have a liability to pay forthwith."
The council yesterday instructed chief executive Stephen Town to take all necessary steps to recover some of the money from the other parties.
Building control claims manager Sally Grey told councillors it was "inaccurate" that the lawyer for the apartment owners, Tim Rainey, had offered the council a settlement of $15 million six weeks before the trial.
Mr Rainey yesterday stood by his claim, saying the offer was not made six weeks before the trial, but in February last year, six months before the case. "They made their decision and chose to take it to trial and that didn't work out so well for them," he said.
The Nautilus building was constructed by Brookfield Multiplex(NZ) between 2002 and 2004. It was certified by the former Rodney District Council.
The council chose not to appeal the substantive case, but has filed an appeal on two minor points.